Frederick Albert Kempf (born 14 October 1977) is a British pianist born in Croydon to a German father and a Japanese mother. He lives in Berlin. Early life Kempf was born in Croydon. He was educated
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x479a2af7a0115b23379bff1023dbc651f7d4322f546fe27fb878704eae8b2b95. Chain 2 (Bitcoin): anchored in block 953758 (2026-06-15T07:48:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b42904da-ae51-41c1-a08e-7d204d42bf2e.json and https://artists.proofprofile.net/proofs/artist/b42904da-ae51-41c1-a08e-7d204d42bf2e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Kempf plays Rachmaninov, Bach-Busoni, Ravel & Stravinsky
Piano Sonata No. 8 in C Minor, Op. 13 "Pathétique": II. Adagio cantabile
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x749696b97922318c30f1b72fa4dc2efe7d7792b1b60242789253851abd789bf8. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEO0460020.
Piano Sonata No. 31 in A-Flat Major, Op. 110: I. Moderato cantabile molto espressivo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e192e734bd3aa85fee7ddd69513decbb2105c9e4332f1952c35e47d6dc6f76e. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEL0020040.
Études, Op. 10: No. 3 in E Major "Tristesse"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc76cf5e4ac8ff3df9387fa5b5b22aa56561b0b2f067d3d3006558fe1b0bf3615. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEN0390030.
Piano Sonata No. 8 in C Minor, Op. 13 "Pathétique": I. Grave - Allegro di molto e con brio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4e470078855c0f61d00062934709ecdbe04f2f262d4a9e18563c61a0c1c302b. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEO0460010.
Piano Sonata No. 14 in C-Sharp Minor, Op. 27 No. 2 "Moonlight": I. Adagio sostenuto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacad07e6536c75d1af2c42601dd621ec46feb55aa1b4619d6c79539c571c27ef. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEO0460040.
Fantaisie Impromptu in C-Sharp Major, Op. 66: Allegro agitato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6982b0372537b34b0e5a459feb81713f45d10c23593db78cbb52b5b1ad75033. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEL0160080.
Piano Sonata No. 8 in C Minor, Op. 13 "Pathétique": III. Rondo: Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4489f8441c3610a3ab5134a6471db51c9a49343430d93437c6a4f491fa22390. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEO0460030.
Piano Sonata No. 14 in C-Sharp Minor, Op. 27 No. 2 "Moonlight": III. Presto agitato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b4a66ba7251910ba1b58dec61b42d27f65645826c95350d3077a609e8045a44. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEO0460060.
Piano Sonata No. 14 in C-Sharp Minor, Op. 27 No. 2 "Moonlight": II. Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddaaac18b4eb41054b80e63e6ef0b747cc44fd4a7de15d1aff11e67f56e3a0c8. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEO0460050.
12 Études, Op. 25: No. 11 in A Minor, "Winter Wind": Lento - Allegro con brio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b2f3d3b8b8440ee2f1ef6932045b9bf4065f8d4902020d0f3cc1760447675b7. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEN0390230.
Études, Op. 10: No. 8, Étude in F Major "Sunshine"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5120851c805f0a4a71d7b6e29c5dfff6c15d2f719746c4e8340f5cdb7205ec3. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEN0390080.